The 46-year-old debuted a powerful new music video for her emotionally-charged single, "Used to Love You," on Tuesday. The simple yet stunning visuals stay locked on Stefani's face throughout the song, while she appears to be reacting to the brutally honest lyrics rather than singing them. See the video in the player below.

If the video looks familiar, that's because it's the same one that served as the stage backdrop when Stefani debuted the song on Saturday. "I just want to share a song that I wrote recently," she told the crowd during her MasterCard Priceless Surprises concert in New York City. "This song is really special."

The lyrics are undoubtedly personal to the No Doubt frontwoman, who filed for divorce from husband Gavin Rossdale in August after nearly 12 years of marriage. In her divorce petition, Stefani cited "irreconcilable differences" and asked for joint custody of the couple's three children: Kingston, 9; Zuma, 6; and Apollo, 1.

Prior to Saturday's concert, Stefani spoke to ET about how music has helped her through the breakup.

"The biggest gift has been to be able to take some tragedy and write a song about it and share that," Stefani said. "The rewards that I've gotten through that is just unbelievable."

While Stefani channels hear heartbreak through music, she's also looking on the bright side. When ET caught up with the singer last month, she had wise words about all the lessons she had learned throughout her tumultuous year. See what she said in the video below.